package com.maxqiu.demo.Lock;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * 顺序执行
 *
 * @author Max_Qiu
 */
public class Sequential {
    public static void main(String[] args) {
        ShareResource shareResource = new ShareResource();
        new Thread(() -> {
            for (int i = 1; i <= 10; i++) {
                try {
                    shareResource.print5(i);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "AA").start();

        new Thread(() -> {
            for (int i = 1; i <= 10; i++) {
                try {
                    shareResource.print10(i);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "BB").start();

        new Thread(() -> {
            for (int i = 1; i <= 10; i++) {
                try {
                    shareResource.print15(i);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "CC").start();
    }

    /**
     * 创建资源类
     */
    private static class ShareResource {
        // 定义标志位
        private int flag = 1; // 1 AA 2 BB 3 CC

        // 创建Lock锁
        private Lock lock = new ReentrantLock();

        // 创建三个condition
        private Condition c1 = lock.newCondition();
        private Condition c2 = lock.newCondition();
        private Condition c3 = lock.newCondition();

        // 打印5次，参数第几轮
        public void print5(int loop) throws InterruptedException {
            // 上锁
            lock.lock();
            try {
                // 判断
                while (flag != 1) {
                    // 等待
                    c1.await();
                }
                // 干活
                System.out.println(Thread.currentThread().getName() + "\t轮数：" + loop);
                // 通知
                flag = 2; // 修改标志位 2
                c2.signal(); // 通知BB线程
            } finally {
                // 释放锁
                lock.unlock();
            }
        }

        // 打印10次，参数第几轮
        public void print10(int loop) throws InterruptedException {
            lock.lock();
            try {
                while (flag != 2) {
                    c2.await();
                }
                // 干活
                System.out.println(Thread.currentThread().getName() + "\t轮数：" + loop);
                // 修改标志位
                flag = 3;
                // 通知CC线程
                c3.signal();
            } finally {
                lock.unlock();
            }
        }

        // 打印15次，参数第几轮
        public void print15(int loop) throws InterruptedException {
            lock.lock();
            try {
                while (flag != 3) {
                    c3.await();
                }
                // 干活
                System.out.println(Thread.currentThread().getName() + "\t轮数：" + loop);
                // 修改标志位
                flag = 1;
                // 通知AA线程
                c1.signal();
            } finally {
                lock.unlock();
            }
        }
    }
}
